John Jay College graduate Kamisha Richards was knifed once in the chest in the Cypress Hills Houses on Sutter Ave. in East New York about 10:35 p.m., officials said.

"It didn't look like she was stabbed," said a relative of Richard's boyfriend. "She just stumbled, and I caught her. Then all she said was, 'Oh, God.' I tried to help her, stop a rag on to stop the bleeding."

Richards was an on-and-off resident of the Cypress Hills complex, home to her boyfriend of seven years, Ramel Henriques.

Kayla Henriques, known in the neighborhood as KK, is the mother of an 11-month-old boy. She was grabbed by police in a building near the crime scene.

Facebook exchanges from over the weekend showed Richards and Henriques trading online insults.